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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-3376) TCK: SQLPathTest.testChildAxisRoot expected root node not in result
Date Thu, 05 Jul 2012 12:54:33 GMT
Thomas Mueller created JCR-3376:
-----------------------------------

             Summary: TCK: SQLPathTest.testChildAxisRoot expected root node not in result
                 Key: JCR-3376
                 URL: https://issues.apache.org/jira/browse/JCR-3376
             Project: Jackrabbit Content Repository
          Issue Type: Improvement
            Reporter: Thomas Mueller
            Assignee: Thomas Mueller
            Priority: Minor


The TCK test SQLPathTest.testChildAxisRoot runs the following SQL-1 query:

    SELECT * FROM nt:base WHERE jcr:path LIKE '/%' AND NOT jcr:path LIKE '/%/%'

It expected the result to be

    /jcr:system, /testroot, /testdata

It does not allow the implementation to return the root node ('/'). According to the specification,
a JCR implementation may filter the root node, as noted by Randall Hauch - http://jackrabbit.510166.n4.nabble.com/TCK-SQLPathTest-testChildAxisRoot-td4655670.html
- quote:

"
Section 6.6.5.1 ("jcr:like function") defines the semantics of the wildcard characters as
generally used within LIKE predicates (and "jcr:like" in XPath):

	"As in SQL, the character '%' represents any string of zero or more 
	characters, and the character '_' (underscore) represents any 
	single character."

while Section 8.5.2.2 ("Pseudo-property jcr:path") specifies the semantics "jcr:path" pseudo
column and narrows the semantics of using LIKE with "jcr:path" in the second-to-last bullet
point:

	"Predicates in the WHERE clause that test jcr:path are only required to 
	support the operators =, <> and LIKE. In the case of LIKE predicates, 
	support is only required for tests using the % wildcard character as a 
	match for a whole path segment (the part between two / characters) 
	or within index brackets...."

Because the '%' matches only a whole path segment, the "/%" literal only matches paths that
have at least one path segment, which means that it matches all descendants of the root node.
"

the specification says "In the case of LIKE predicates, support is only required for tests
using the % wildcard character as a match for a whole path segment (the part between two /
characters)..." but it doesn't specify it needs to do so.

To allow an implementation to return the root node, I suggest to change the test as follows:

... AND NOT jcr:path LIKE '/%/%' AND jcr:path <> '/'



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